How to Fix Exchange Admin Center Resource Mailbox Delegate Bugs
Question details
The user needs to investigate and report an issue where delegate changes for resource mailboxes are not being saved in the new Exchange Admin Center.
- Product
- Microsoft Exchange
- Device & OS
- not provided
- Scenario
- Updating delegate settings for resource mailboxes using the new Exchange Admin Center interface.
- Observed behavior
- Modifications appear to save successfully in the user interface but are actually discarded by the system. The classic Exchange admin center does not exhibit this issue and works correctly.
Ensure you have Exchange Administrator privileges in your Microsoft 365 environment and have access to both the new and classic Exchange Admin Center interfaces.
Use the Classic Exchange Admin Center as a Workaround
Since the bug is isolated to the new Exchange Admin Center, utilizing the classic interface allows you to successfully save resource mailbox delegate changes.
Microsoft is actively investigating the behavior of the new Exchange Admin Center. Until a permanent patch is deployed, the classic Exchange Admin Center remains a reliable alternative for modifying resource mailbox settings.
Log in to the new Exchange Admin Center, locate the left navigation pane, and click on 'Classic Exchange admin center' to switch views.
In the classic interface, go to the 'recipients' section and click on the 'resources' tab.
Double-click the specific resource mailbox you want to modify to open its properties.
Navigate to the 'mailbox delegation' or 'booking delegates' section, make your required changes, and click 'Save'. The settings will now be retained properly.
Collect Diagnostic Logs and Report to Microsoft
To help Microsoft permanently resolve the saving issue in the new admin center, gather necessary web logs and submit a support ticket.
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Frequently Asked Questions
Why are my resource mailbox delegate changes not saving in the new Exchange Admin Center?
This is a known user interface bug in the new Exchange Admin Center where the 'Save' action processes without throwing an error, but the backend system fails to retain the changes. Microsoft is actively investigating this behavior.
Does this saving bug affect the classic Exchange Admin Center?
No, the classic Exchange Admin Center processes resource mailbox delegate updates correctly. You can safely use it as a reliable workaround until the new center is officially patched.
What diagnostic information should I provide when reporting this bug to Microsoft?
You should provide a screen recording showing the save failure, network web logs (HAR file) extracted from your browser's developer tools, your tenant details, and the specific browser version you are using.
